English verb conjugation
COULD CAPTAIN

Regular verb: captain - captained - captained

Affirmation

Simple form	V-ing form
I could captain you could captain he could captain we could captain you could captain they could captain	I could be captaining you could be captaining he could be captaining we could be captaining you could be captaining they could be captaining
Perfect	V-ing perfect
I could have captained you could have captained he could have captained we could have captained you could have captained they could have captained	I could have been captaining you could have been captaining he could have been captaining we could have been captaining you could have been captaining they could have been captaining

Negation

Simple form	V-ing form
I couldn't captain you couldn't captain he couldn't captain we couldn't captain you couldn't captain they couldn't captain	I couldn't be captaining you couldn't be captaining he couldn't be captaining we couldn't be captaining you couldn't be captaining they couldn't be captaining
Perfect	V-ing perfect
I couldn't have captained you couldn't have captained he couldn't have captained we couldn't have captained you couldn't have captained they couldn't have captained	I couldn't have been captaining you couldn't have been captaining he couldn't have been captaining we couldn't have been captaining you couldn't have been captaining they couldn't have been captaining

Interrogative form

Simple form	V-ing form
could I captain? could you captain? could he captain? could we captain? could you captain? could they captain?	could I be captaining? could you be captaining? could he be captaining? could we be captaining? could you be captaining? could they be captaining?
Perfect	V-ing perfect
could I have captained? could you have captained? could he have captained? could we have captained? could you have captained? could they have captained?	could I have been captaining? could you have been captaining? could he have been captaining? could we have been captaining? could you have been captaining? could they have been captaining?

Interro-negative form

Simple form	V-ing form
couldn't I captain? couldn't you captain? couldn't he captain? couldn't we captain? couldn't you captain? couldn't they captain?	couldn't I be captaining? couldn't you be captaining? couldn't he be captaining? couldn't we be captaining? couldn't you be captaining? couldn't they be captaining?
Perfect	V-ing perfect
couldn't I have captained? couldn't you have captained? couldn't he have captained? couldn't we have captained? couldn't you have captained? couldn't they have captained?	couldn't I have been captaining? couldn't you have been captaining? couldn't he have been captaining? couldn't we have been captaining? couldn't you have been captaining? couldn't they have been captaining?